Handle of electronic toothbrush



FIG. 1 is a front top perspective view;

FIG. 2 is a front view;

FIG. 3 is a rear view;

FIG. 4 is a left side view;

FIG. 5 is a right side view;

FIG. 6 is a top view; and,

FIG. 7 is a bottom view.

The broken lines shown on the drawings depict portions of the electronic toothbrush that form no part of the claimed design. 

CLAIM The ornamental design for a handle of an electronic toothbrush, as shown and described. 